ZacharyZhang-NY
596c62e026
Bars, lines, areas, pies, donuts, radar, histogram, scatter, bubbles, heatmaps, gauge, bullet, funnel, waterfall, treemap, candles, box plots, steps, rings, legend, axis, crosshair, polar area, pyramid, spectrum bars and win-loss strips, each drawn dot by dot. Ticks follow 1-2-5 steps and print as precisely as their step needs; a label row uses micro letters or the pixel font as a whole. Descriptions carry the data in numbers. Bad data panics.
42 lines
1.3 KiB
Go
42 lines
1.3 KiB
Go
package chart
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/egoist/mygo/ui"
|
|
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
|
|
)
|
|
|
|
type AreaChartOptions struct {
|
|
// Width and Height are dots; zeros mean 160 by 80.
|
|
Width, Height int
|
|
Slot pixel.Slot
|
|
}
|
|
|
|
// AreaChart draws a line with the area below it dithered.
|
|
func AreaChart(c *ui.Context, text string, labels []string, values []float64, o AreaChartOptions) *ui.Element {
|
|
k := pixel.K(c)
|
|
w, h := size("AreaChart", o.Width, o.Height, 160, 80)
|
|
if len(values) != len(labels) || len(values) < 2 {
|
|
panic(fmt.Sprintf("chart: AreaChart has %d labels for %d values", len(labels), len(values)))
|
|
}
|
|
s := []Series{{Name: text, Values: values, Slot: pick(o.Slot, 0)}}
|
|
lo, hi := span(values)
|
|
p := fit(min(0, lo), max(0, hi), w, h, labels)
|
|
return ui.Box(c).Size(k.D(w), k.D(h)).Role(ui.RoleImage).Label(text).Description(read(labels, values)).Draw(func(pt *ui.Painter, r ui.Rect) {
|
|
g := k.Canvas(pt, r)
|
|
p.grid(g, labels)
|
|
// The area spans from the line to zero, either way.
|
|
n, base := len(values), p.at(0)
|
|
for i := 1; i < n; i++ {
|
|
x0, x1 := p.slot(i-1, n), p.slot(i, n)
|
|
for x := x0; x < x1; x++ {
|
|
y := p.at(values[i-1] + (values[i]-values[i-1])*float64(x-x0)/float64(x1-x0))
|
|
g.Veil(x, min(y, base), 1, abs(y-base), s[0].Slot, 6)
|
|
}
|
|
}
|
|
lines(g, p, n, s)
|
|
})
|
|
}
|